<h1>Reliability of a test</h1>

<p><b><u>Is our test <u>reliable</u>?</u></b></p>

<p>A teacher produces 100 test questions to examine students on "History of World War II." To ensure reliability, and without stopping to evaluate the content of each, how many questions should be used?</p>
    <ol>a) -20.</ol>
    <ol><ul><i>(Being able to expand the sample questions should not be limited to so few, because time should not be a problem in this case.)</i></ul></ol>
    <ol>b) -<u>50.</u></ol>
    <ol><ul><i>(Right.)</i></ul></ol>
    <ol>c) -80.</ol>
    <ol><ul><i>(In that case, it is likely that fatigue did dent students, causing an undesired effect of contamination of the results.)</i></ul></ol>
